Field test research on integral fracturing of deep sandy conglomerate
The deep sandy conglomerate reservoir in Mahu has deep burial depth and strong heterogeneity,so fracturing is faced with difficulties in fracture initiation,easy overpressure in construction and low fracture complexity.In order to realize the large-scale development of Mahu deep sandy conglomerate reservoir and explore the applicability of integral fracturing technology in deep sandy conglomerate reservoir,an integral fracturing field test study of platform three-dimensional well pattern was carried out.By using finite element method and geoengineering integrated platform,cluster spacing and well spacing are optimized to realize active utilization of spatial stress field.The pressure response law and the influence of acid soaking and slug grinding on fracturing construction are analyzed.The research shows that the cluster spacing of 15-25 m and the well spacing of 300 m of the four-well platform can ensure that the uniform propagation of multiple fractures and the active utilization of the spatial stress field can be realized.The construction difficulty of the four-well platform overall fracturing is distributed in a descending pattern along the horizontal trajectory.It is easier to raise the displacement in the heel section,the fracturing stimulation is less difficult and the difficulty near the toe section is larger.In areas where drilling fluid loss occurs,the difficulty of fracturing is significantly increased.The four wells can significantly reduce the construction pressure by about 25 MPa after the acid soaking treatment,and the average construction time of a single stage can be saved by 83.7 min by continuous acid feeding compared with stopping the acid pumping process.40/70 mesh quartz is used to grind 2-3 slug and the pressure drop is obvious,showing the characteristics of erosion pressure drop.
deep sandy conglomerateintegral fracturinginterwell interferenceacid soaking treatmentslug grinding
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维普
